WEATHER SERVICE IS DECIDING WHAT CAUSED SO MUCH DAMAGE IN YESTERDAYS STORM. 40/29'S METEOROLOGIST DARBY BYBEE WAS THERE TOO. HE'S LIVE NOW IN FORT SMITH, AND FOUND OUT A COUPLE OF THINGS COULD HAVE CAUSED THE DESTRUCTION. THE NATIONAL WEATHER SERVICE HAVEN'T YET MADE A FINAL DECISION ON WHETHER OR NOT A TORNADO CAUSED THIS MESS. BUT, CLEARLY THE DAMAGE HERE WAS SIGNIFICANT, EVEN IF IT WAS CONFINED TO A RELATIVELY SMALL AREA. IF IT WAS STRAIGHT LINE WINDS, YOU WOULD EXPECT TO SEE DAMAGE OVER A BIG AREA. AT CHAFFEE CROSSING, THE WORST OF THE DAMAGE REALLY ONLY COVERS A FEW HUNDRED FEET. (DARBY) "You'd expect more of a confined area of damage with tornadoes and that's kind of what we've got here." "You know you're right it really is more of a confined path, and we know that looking at some of the radar data, and we've seen some posts on social media, we know that there was some broad circulation within this zone." CIRCULATION, SAYS STEVE PILTZ WITH THE NATIONAL WEATHER SERVICE, THAT IS AT LEAST PARTIALLY INDICATIVE OF A TORNADO-LIKE EVENT, CALLED A GUSTNADO. GUSTDADOES ARENT AS STRONG AS TORNADOES. "So, even though this is very dramatic looking, the wind speeds probably at least in the 75 to 85 mile an hour range would be a first guess." PILTZ SAYS EVEN A MICROBURST IS A POSSIBILITY. THAT'S WHEN THE WINDS ARE FORCED DOWNWARD OUT OF THE STORM AND THEN OUTWARD WHEN THEY REACH THE GROUND. (DARBY) "I saw this and I though this was pretty impressive. I mean this is a piece of piping. I'd say this has gotta be pretty close to 200 hundred pounds, clearly a pretty heavy object. Looks like it was probably carried at least a hundred, maybe a hundred and fifty feet." "It looks like it came from the buildings over there and probably flew in with part of the roof. Just like an airplane wing lifts lifts a heavy air craft, roofs often act the same way in very high wind storms." EVEN THOUGH THIS IS PRETTY BAD OUT HERE, THESE BUILDING ARE NOT WHAT WE WOULD CONSIDER STURDY STRUCTURES, MEANING ANYTHING FROM STRAIGHT LINE WINDS TO A GUSTNADO OR EVEN A WEAK TORNADO COULD HAVE DONE THIS DAMAGE. LIVE AT CHAFFEE CROSSING, DARBY BYBEE, 40/29 NEWS. STORM SURVEYORS ALSO LOOKED AT DAMAGE IN OZARK TODAY. THEY EXPECT TO MAKE A DECISION

Israeli Prime Minister Benjamin Netanyahu warned Tuesday that a proposed agreement between world powers and Iran was "a bad deal" that would not stop Tehran from getting nuclear weapons -- but would rather pave its way to getting lots of them and lea...